Roller burnishing is a surface finishing method and a metal forming process. During roller burnishing, a diamond sphere is rigidly pressed against the workpiece’s surface and rotates around the rotating axis. This creates such a lot of tension in those areas where the metal is roughest, that it plasticises and those peaks ‘iron out’. This results in a dense and uniform surface down to the µm-range.

Advantages of roller burnishing:

• Improves finished surface
• High ratio of bearing area to total area / no protruding peaks
• Formation of plateaus with small recesses (which could act as lubricant pockets)
• Improves the roundness of precision-turned profiles
• Does not affect the outcome through surface interruptions (oil hole, trapezoidal contour)
• Improves hardness (cold working)